JPH11254490A - Mold for injection molding and method for injection molding - Google Patents
Mold for injection molding and method for injection moldingInfo
- Publication number
- JPH11254490A JPH11254490A JP6127198A JP6127198A JPH11254490A JP H11254490 A JPH11254490 A JP H11254490A JP 6127198 A JP6127198 A JP 6127198A JP 6127198 A JP6127198 A JP 6127198A JP H11254490 A JPH11254490 A JP H11254490A
- Authority
- JP
- Japan
- Prior art keywords
- gate
- resin
- injection molding
- mold
- filling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001746 injection moulding Methods 0.000 title claims description 30
- 238000000034 method Methods 0.000 title description 8
- 239000011347 resin Substances 0.000 claims abstract description 67
- 229920005989 resin Polymers 0.000 claims abstract description 67
- 238000003860 storage Methods 0.000 claims description 14
- 238000002347 injection Methods 0.000 abstract description 18
- 239000007924 injection Substances 0.000 abstract description 18
- 238000000465 moulding Methods 0.000 abstract description 17
- 238000001816 cooling Methods 0.000 abstract description 15
- 239000000243 solution Substances 0.000 abstract 1
- 238000004904 shortening Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、射出成形用金型及
び射出成形方法に関し、より詳しくはシャットオフ構造
のゲートピンを有する射出成形用金型及び射出成形方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die and an injection molding method, and more particularly to an injection molding die having a gate pin having a shut-off structure and an injection molding method.
【０００２】[0002]
【従来の技術】射出成形における成形サイクルは、樹脂
充填、保圧、計量とともに冷却、型開閉の各工程に分類
される。これらの工程の中で保圧にかかる時間は、成形
される樹脂の種類やゲート方式や成形品の大きさによっ
て影響され、射出成形用金型がコールドランナシステム
であるか、ホットランナシステムであるかによっても影
響される。したがって一概には言えないが、一般的な成
形方法では保圧にかかる時間は、成形サイクルの約５〜
６％程度を占めている。2. Description of the Related Art A molding cycle in injection molding is classified into respective steps of cooling, opening and closing of a mold as well as resin filling, dwelling and measuring. The time required for holding pressure in these processes is affected by the type of resin to be molded, the gate method, and the size of the molded product, and the injection molding die is a cold runner system or a hot runner system. It is also affected by Therefore, although it cannot be said unconditionally, the time required for holding pressure in a general molding method is about 5 to 5 in the molding cycle.
It accounts for about 6%.
【０００３】ところで、成形サイクルにかかる時間の短
縮は、射出成形における生産性の向上につながるので、
すでにさまざまな改良がなされている。そのため、時間
を大幅に短縮できる改良はほぼ出尽くしており、成形サ
イクルの数％の時間短縮が図れる改良項目でさえ数少な
く、しかも難しくなっている。そこで、射出成形におい
て保圧を省略してこれにかかる時間を短縮するだけで
も、十分有効な成形サイクルの時間短縮となる。[0003] By the way, shortening the time required for the molding cycle leads to improvement in productivity in injection molding.
Various improvements have already been made. For this reason, improvements that can significantly reduce the time have been almost exhausted, and even the improvements that can reduce the time of the molding cycle by several percent are few and difficult. Therefore, simply omitting the holding pressure in injection molding and shortening the time required for this also results in a sufficiently effective molding cycle time reduction.
【０００４】ところが、この保圧工程には、ゲート部が
シールできるまでの溶融状態の樹脂の逆流防止と、ヒ
ケ、ボイドの防止を行い外観形状を良好に保つ効果
（「射出成形技術の基本と応用」 Ｐ１５４ 発行元
日本プラスチック加工技術協会）と、金型内の樹脂の未
冷却部、すなわち成形品内部に、樹脂を追加供給するこ
とにより物性を向上させて高品質を保つ働きがある。However, in this pressure-holding step, the effect of preventing the backflow of the resin in the molten state until the gate portion can be sealed, preventing sink marks and voids, and keeping the appearance in good shape (see "Basics of injection molding technology"). Application "P154 Publisher
The Japan Plastics Processing Technology Association) has the function of improving the physical properties and maintaining high quality by additionally supplying the resin to the uncooled portion of the resin in the mold, that is, the inside of the molded product.
【０００５】例えば、オープンゲートを使用したコール
ドランナ方式の場合では、保圧をかけないとゲート部よ
り充填樹脂が逆流してしまう。また、図６（ａ）に示す
ホットランナ方式のノズル構造を使用した従来のバルブ
ゲートによる射出成形用金型は、ゲート部を図６（ｂ）
に示す構造とするのが主流であり、図６（ｂ）に示すよ
うにゲートピン８は長さｌのゲート部をゲート部先端ま
で摺動して樹脂流路を閉鎖している。そして、この射出
成形用金型では、保圧をかけないと冷却が進行するに従
い、成形品の厚肉部やゲート部の周辺にヒケが発生して
品質が低下する。For example, in the case of a cold runner system using an open gate, the filling resin flows backward from the gate unless a pressure is applied. In addition, in a conventional injection molding die using a valve gate using a hot runner type nozzle structure shown in FIG.
The structure shown in FIG. 6 is the mainstream, and as shown in FIG. 6B, the gate pin 8 slides the gate portion of length l to the tip of the gate portion to close the resin flow path. In this injection molding die, unless cooling pressure is applied, as the cooling progresses, sinks occur around the thick portion and the gate portion of the molded product, and the quality deteriorates.
【０００６】[0006]
【発明が解決しようとする課題】したがって、保圧は樹
脂を成形する上で省略できない極めて重要な工程である
ので、保圧工程を省略して、成形サイクルの時間を短縮
することが望めなかった。本発明の目的は、上記問題点
に鑑みて外観形状を良好に保ち、かつ製品品質を安定に
維持しつつ、成形サイクルの時間を短縮できる射出成形
用金型及び射出成形方法を提供することである。Therefore, since the holding pressure is an extremely important step that cannot be omitted in molding the resin, it was not expected to omit the holding pressure step and shorten the time of the molding cycle. . An object of the present invention is to provide an injection molding die and an injection molding method capable of shortening a molding cycle time while maintaining a good appearance and a stable product quality in view of the above problems. is there.
【０００７】[0007]
【課題を解決するための手段】このような目的を達成す
るために、請求項１記載の発明にかかる射出成形用金型
は、シャットオフ構造のゲートピンを有する射出成形用
金型において、ゲート部先端に保圧による樹脂充填量に
相当する樹脂量を貯溜できる樹脂貯溜部があることを特
徴とする射出成形用金型である。In order to achieve the above object, an injection mold according to the present invention is provided in an injection mold having a gate pin having a shut-off structure. An injection molding die, characterized in that a resin storage portion capable of storing a resin amount corresponding to a resin filling amount due to holding pressure is provided at a tip end.
【０００８】請求項１記載の発明による射出成形用金型
での保圧による樹脂充填量とは、射出充填を完了した後
の金型キャビティ内における溶融樹脂の冷却に伴う収縮
分の樹脂量のことである。[0008] The amount of resin charged by holding pressure in the injection molding die according to the first aspect of the present invention refers to the amount of resin that is contracted due to cooling of the molten resin in the mold cavity after the injection filling is completed. That is.
【０００９】そして、請求項２記載の発明にかかる射出
成形方法は、樹脂の充填が完了した後、シャットオフ構
造のゲートピンでゲート部を閉じた後、次いでゲート部
先端の樹脂貯溜部から保圧による樹脂充填量に相当する
樹脂量を注入する方法であり、これにより保圧工程を省
略することができる。In the injection molding method according to the second aspect of the present invention, after filling of the resin is completed, the gate portion is closed with a gate pin having a shut-off structure, and then the pressure is maintained from the resin storage portion at the tip of the gate portion. This is a method of injecting the amount of resin corresponding to the amount of resin charged by the method described above, whereby the pressure-holding step can be omitted.
【００１０】（作用）型閉じ完了後射出充填された溶融
樹脂は急速に冷却固化していき、それと共に収縮してい
く。しかし、ゲート部先端の樹脂貯溜部に溜められた溶
融樹脂が射出充填完了と同時に金型キャビティ内に供給
されるので、収縮分の樹脂があらかじめキャビティ内に
補充されている。その結果、成形品の冷却固化の間はも
ちろんのこと、冷却が完了しても成形品の容積が所定量
に保たれるので、保圧により達成される効果がこの方法
によっても得られる。これにより保圧工程を省略して、
射出充填後直ちに冷却させることが可能となるので、成
形時間を短縮することが可能となる。すなわち、その重
要性から省くことができなかった保圧を省略することが
できる。(Function) After the mold is closed, the molten resin injected and filled rapidly cools and solidifies, and shrinks with the cooling. However, since the molten resin stored in the resin storage portion at the tip of the gate portion is supplied into the mold cavity at the same time as the completion of the injection filling, the shrinkage of the resin is replenished in the cavity in advance. As a result, the volume of the molded article is maintained at a predetermined amount even after the cooling is completed, as well as during the cooling and solidification of the molded article, so that the effect achieved by the holding pressure can be obtained by this method. As a result, the pressure holding step is omitted,
Since cooling can be performed immediately after injection filling, molding time can be reduced. That is, it is possible to omit the holding pressure which cannot be omitted due to its importance.
【００１１】[0011]
【発明の実施の形態】以下に、請求項１記載の発明の実
施の形態を、図面を参照しつつ詳しく説明する。図１
（ａ）に示すように、射出成形用金型には、取り付け板
１とスプルノズル２とスペーサ３とキャビティブロック
４とマニホールド５とがあり、ホットランナノズル６
が、マニホールド５に取り付けられている。キャビティ
ブロック４は、図示しないコアブロックとスライドコア
とから透視図で図示した金型キャビティ４ａを形成して
いる。図１（ｂ）は、ホットランナノズル６を拡大した
断面図であり、ゲート部は金型キャビティ４と嵌め合い
構造となっており、ゲート部は金型キャビティ４ａへ開
口している。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; FIG.
As shown in (a), the injection molding die includes a mounting plate 1, a sprue nozzle 2, a spacer 3, a cavity block 4, and a manifold 5, and a hot runner nozzle 6.
Are attached to the manifold 5. The cavity block 4 forms a mold cavity 4a shown in a perspective view from a core block (not shown) and a slide core. FIG. 1B is an enlarged cross-sectional view of the hot runner nozzle 6, in which the gate portion has a fitting structure with the mold cavity 4, and the gate portion is open to the mold cavity 4a.
【００１２】次に、ゲート部先端に形成される樹脂貯溜
部の実施形態について説明する。図２はゲート部に樹脂
貯溜部を設けた形態である。図２（ａ）はホットランナ
ノズル６のゲート部縦断面図、図２（ｂ）は図２（a ）
のＡ−Ａ’面断面図である。Next, an embodiment of a resin reservoir formed at the tip of the gate will be described. FIG. 2 shows an embodiment in which a resin storage section is provided in the gate section. FIG. 2A is a vertical sectional view of the gate portion of the hot runner nozzle 6, and FIG. 2B is FIG.
3 is a sectional view taken along the line AA ′ of FIG.
【００１３】図２（ａ）に示すように、ホットランナノ
ズル６は、ゲート部先端から樹脂流路を閉鎖した時のゲ
ートピン８先端までの長さ、すなわち平行部の長さａを
設けたゲート部となっている（以下「平行部の長さで示
したゲート部部分を平行部」という）。また、ホットラ
ンナノズル６内にはゲートピン８がある。図２（ｃ）に
示すようにホットランナ６のゲート部をゲートピン８で
閉じると、ゲート部の樹脂流路は閉鎖される。しかし、
このゲートピン８はゲート部先端まで摺動しないように
させることができるので、射出充填後のゲート部先端の
平行部には溶融樹脂が貯溜されることになる。従来行わ
れてきた保圧における樹脂充填量は、使用する樹脂、成
形品のゲート部での厚さ、成形品の大きさ等の製品条件
によって決まり、計算及び実験から求められる。したが
って、樹脂貯溜部ｂの容積がこの樹脂充填量に相当する
ようにゲート内径ｃと平行部の長さａを設計することに
より、ゲートピン８を閉じた時にちょうど保圧における
樹脂充填量に相当する樹脂量を樹脂貯溜部ｂに貯溜させ
ることができる。As shown in FIG. 2A, the hot runner nozzle 6 has a length from the tip of the gate portion to the tip of the gate pin 8 when the resin flow path is closed, that is, a gate having a length a of the parallel portion. (Hereinafter, the gate portion indicated by the length of the parallel portion is referred to as a parallel portion). Further, a gate pin 8 is provided in the hot runner nozzle 6. When the gate of the hot runner 6 is closed by the gate pin 8 as shown in FIG. 2C, the resin flow path of the gate is closed. But,
Since the gate pin 8 can be prevented from sliding to the tip of the gate, molten resin is stored in a parallel portion at the tip of the gate after injection and filling. The resin filling amount in the conventional holding pressure is determined by the resin used, the thickness of the molded product at the gate portion, the size of the molded product, and the like, and can be obtained from calculations and experiments. Therefore, by designing the length a of the parallel portion to the inside diameter c of the gate so that the volume of the resin storage portion b corresponds to the amount of resin filling, when the gate pin 8 is closed, it corresponds to the amount of resin filling just under the pressure. The resin amount can be stored in the resin storage part b.
【００１４】また、図２（ａ）及び（ｂ）に示すよう
に、ホットランナノズル６には振れどめ９が設けられて
いることが望ましく、振れどめ９がゲートピン８をゲー
ト部に案内するのでゲートピン８の位置決め精度を高め
ることができ、樹脂貯溜部ｂの容量を正確にすることで
きる。As shown in FIGS. 2 (a) and 2 (b), it is desirable that the hot runner nozzle 6 is provided with a shaker 9, and the shaker 9 guides the gate pin 8 to the gate portion. Therefore, the positioning accuracy of the gate pin 8 can be improved, and the capacity of the resin storage portion b can be made accurate.
【００１５】次に、この射出成形用金型を使用して射出
成形する方法について図３により説明する。射出成形用
金型を型閉じさせた後、ゲートピンで閉じられていたゲ
ート部を開き、ゲート部に通常の射出成形方法に従い樹
脂を充填させる。かかる充填の後ゲートピン８でゲート
部を閉じ、ゲート部先端の樹脂貯溜部ｂに保圧による溶
融樹脂量に相当する樹脂量を貯溜させる。Next, a method for injection molding using the injection mold will be described with reference to FIG. After closing the mold for injection molding, the gate portion closed by the gate pin is opened, and the gate portion is filled with resin according to a normal injection molding method. After the filling, the gate portion is closed by the gate pin 8, and the resin storage portion b at the tip of the gate portion stores a resin amount corresponding to the molten resin amount due to the pressure holding.
【００１６】このゲートピン８でゲート部を閉じる動作
が完了すると同時に、金型キャビティ４ａの冷却を開始
して金型キャビティ４ａ内の樹脂を冷却させる。冷却と
同時、或いは冷却初期において、ゲートピン８をゲート
部先端まで摺動させて樹脂貯溜部ｂに貯溜された樹脂を
金型キャビティ４ａ内へ圧入させる。次いで、冷却が完
了した成形品を型を開き取り出す。At the same time when the operation of closing the gate portion with the gate pin 8 is completed, cooling of the mold cavity 4a is started to cool the resin in the mold cavity 4a. Simultaneously with the cooling or at the initial stage of the cooling, the gate pin 8 is slid to the tip of the gate portion to press the resin stored in the resin storage portion b into the mold cavity 4a. Next, the mold after cooling is opened and taken out.
【００１７】以上の工程により成形品を製造する１サイ
クルが終了する。次に、射出充填と型開閉動作のタイミ
ングの調整を図４に基づいて説明する。樹脂の充填が完
了すると樹脂充填完了信号１２が成形機制御ユニット１
０から油圧制御ユニット１１に送られ、ゲートピンの閉
信号１４となりゲートピンの駆動装置１６を作動させて
ゲート部で樹脂流路を閉塞させる。次いで、ゲートピン
をゲート部先端まで摺動させて樹脂貯溜部に貯溜された
樹脂を圧入させる。成形品を取り出し、型閉じを行った
後樹脂を充填できる状態になると、成形機制御ユニット
１０より型閉じ完了信号１３が油圧制御ユニット１１へ
送られることによりゲートピンの開信号１５となりゲー
トピンの駆動装置１６を作動させゲート部で樹脂流路を
開放させる。One cycle of manufacturing a molded article is completed by the above steps. Next, adjustment of the timing of the injection filling and the mold opening / closing operation will be described with reference to FIG. When the resin filling is completed, the resin filling completion signal 12 is sent to the molding machine control unit 1
From 0, the signal is sent to the hydraulic control unit 11 and becomes a gate pin closing signal 14 to operate the gate pin driving device 16 to close the resin flow path at the gate. Next, the gate pin is slid to the tip of the gate portion to press-fit the resin stored in the resin storage portion. When the molded product is taken out and the resin can be filled after the mold is closed, a mold closing completion signal 13 is sent from the molding machine control unit 10 to the hydraulic control unit 11, so that a gate pin open signal 15 is obtained, and a gate pin driving device is provided. Activate 16 to open the resin flow path at the gate.
【００１８】（実施例）図５に示すようにゲート部先端
の平行部の長さａを５．０ｍｍ、ゲート内径ｃを４．０
ｍｍ＋０．０２ｍｍ、ゲートピン８先端の外径ｄを４．
０ｍｍ−０．０２ｍｍとするホットランナノズル６を備
えた射出成形用金型を用い、塩化ビニル樹脂から内径５
０ｍｍの管継手（重量１１ｇ）を成形した。(Embodiment) As shown in FIG. 5, the length a of the parallel portion at the tip of the gate is 5.0 mm, and the inner diameter c of the gate is 4.0.
mm + 0.02 mm, the outer diameter d of the tip of the gate pin 8 is set to 4.
Using an injection mold equipped with a hot runner nozzle 6 of 0 mm-0.02 mm, an inner diameter 5 mm
A 0 mm pipe joint (11 g in weight) was formed.
【００１９】射出成形用金型を型閉じした後、高速射出
充填により９．１秒間で金型キャビティ４ａ内に溶融樹
脂を充填した。充填完了と共にゲートピン８によりゲー
ト部を閉じさせた。ゲート部を閉じるのに要した時間は
０．０２秒間であった。ゲートピン８には制御圧力とし
てキャビテ４ａ内に樹脂に対して、５０Ｋｇ／ｃｍ2の
圧力をかけた。ゲート部を閉じるとただちに、計量と共
に１７秒間冷却した。ゲート部を閉じてから１秒後に、
ゲートピン８をゲート部先端まで摺動させてゲート部の
樹脂貯溜部ｂから製品重量の約１％（重量で０．９ｇ）
の樹脂をキャビティ４ａ内へ圧入した。After closing the injection mold, the molten resin was filled into the mold cavity 4a in 9.1 seconds by high-speed injection filling. The gate portion was closed by the gate pin 8 upon completion of the filling. The time required to close the gate was 0.02 seconds. As a control pressure, a pressure of 50 kg / cm 2 was applied to the resin in the cavity 4 a to the gate pin 8. Immediately after closing the gate, cooling was performed for 17 seconds with weighing. One second after closing the gate,
The gate pin 8 is slid to the tip of the gate portion, and approximately 1% of the product weight (0.9 g in weight) from the resin storage portion b of the gate portion.
Was pressed into the cavity 4a.
【００２０】冷却を完了した後成形品を取り出して再び
型を閉じた。この間の作業時間は１０秒間だった。型閉
じ後ゲートピン８を開いた。ゲートピン８を開くのにか
かった時間は０．０２秒間だった。After cooling was completed, the molded product was taken out and the mold was closed again. The working time during this time was 10 seconds. After closing the mold, the gate pin 8 was opened. The time required to open the gate pin 8 was 0.02 seconds.
【００２１】（比較例）ゲート部先端に樹脂貯溜部ｂを
設けないことを除けば実施例と同様の射出成形用金型を
使用した。射出成形方法は溶融樹脂を高速射出充填した
後、保圧を５．０秒間行った。なお、保圧工程は樹脂の
充填速度が５ｍｍ／秒であって、圧力３．５Ｋｇ／ｃｍ
2で２秒間、その後６．５Ｋｇ／ｃｍ2 で３秒間とする
２段階の圧力制御を行った。この保圧工程を行ったこと
以外の製造工程は、実施例と同様にして行った。成形後
取り出した成形品に外観上の問題はみられなかった。実
施例と比較例の各工程にかかった時間を表１にまとめ
た。(Comparative Example) An injection mold similar to that of the embodiment was used except that the resin reservoir b was not provided at the tip of the gate. In the injection molding method, after the molten resin was injected at a high speed, a holding pressure was performed for 5.0 seconds. In the pressure holding step, the filling speed of the resin was 5 mm / sec, and the pressure was 3.5 kg / cm.
2 for 2 seconds, and then 6.5 kg / cm 2 for 3 seconds. Manufacturing steps other than performing the pressure holding step were performed in the same manner as in the example. No problem in appearance was observed in the molded product taken out after molding. Table 1 summarizes the time required for each step of the examples and the comparative examples.
【００２２】[0022]
【表１】 [Table 1]
【００２３】保圧にかえてゲートピンにより貯溜樹脂を
圧入することで、４秒間の時間短縮が達成され、本発明
により従来の保圧工程にかかる時間を約２０％の時間に
短縮した。By press-fitting the stored resin with the gate pins instead of the pressure holding, a time reduction of 4 seconds was achieved, and the time required for the conventional pressure holding step was reduced to about 20% by the present invention.
【００２４】[0024]
【発明の効果】請求項１記載の発明である射出成形用金
型を使用し、請求項２記載の発明の射出成形方法で成形
することで、従来の保圧工程が不要になるので、成形サ
イクルを大幅に短縮することができる。成形サイクルの
短縮によって、製品の製造コストが低減される。また、
型閉じ後から冷却、型開きまでの間、型閉じ状態を維持
するので、金型キャビティ内に外乱要因が発生しない。
したがって、製品品質の安定した成形品を製造できる。By using the injection molding die according to the first aspect of the present invention and performing molding by the injection molding method according to the second aspect of the present invention, the conventional pressure-holding step becomes unnecessary. The cycle can be significantly reduced. The shortening of the molding cycle reduces the production costs of the product. Also,
Since the mold closed state is maintained after the mold is closed until the mold is cooled and opened, no disturbance factor occurs in the mold cavity.
Therefore, a molded product having stable product quality can be manufactured.
【図１】（ａ）発明の一実施形態である射出成形用金型
の断面図 （ｂ）射出成形用金型のホットランナ部分を拡大した縦
断面図FIG. 1A is a cross-sectional view of an injection mold according to an embodiment of the invention. FIG. 1B is an enlarged vertical cross-sectional view of a hot runner portion of the injection mold.
【図２】（ａ）発明の一実施形態である射出成形用金型
のゲート部付近の縦断面図 （ｂ）発明の一実施形態である射出成形用金型のゲート
部付近のＡ−Ａ’面断面図 （ｃ）ゲートピンを閉じた状態のゲート部付近の縦断面
図FIG. 2 (a) is a longitudinal sectional view of the vicinity of a gate portion of an injection mold according to one embodiment of the present invention. (B) AA near the gate portion of an injection mold according to one embodiment of the present invention. 'Cross section view (c) Longitudinal section near the gate with the gate pin closed
【図３】発明の射出成形方法の流れ図FIG. 3 is a flowchart of the injection molding method of the invention.
【図４】ゲートピンと型開閉動作の連動機構を示す概念
図FIG. 4 is a conceptual diagram showing an interlocking mechanism between a gate pin and a mold opening / closing operation.
【図５】実施例に使用した射出成形用金型のホットラン
ナノズル形状を示す断面図FIG. 5 is a cross-sectional view showing the shape of a hot runner nozzle of an injection mold used in Examples.
【図６】（ａ）従来のバルブゲート方式の射出成形用金
型のホットランナ断面図 （ｂ）従来のバルブゲート方式の射出成形用金型のゲー
ト部付近の断面図6A is a cross-sectional view of a hot runner of a conventional valve gate type injection molding die. FIG. 6B is a cross-sectional view of a vicinity of a gate portion of a conventional valve gate type injection molding die.
１ 取り付け板 ２ スプルノズル ３ スペーサ ４ キャビティブロック ４ａ 金型キャビティ ５ マニホールド ６ ホットランナ ８ ゲートピン ９ 振れ止め １０ 成形機制御ユニット １１ 油圧制御ユニット １２ 樹脂充填完了信号 １３ 型閉じ完了信号 １４ ゲートピンの閉信号 １５ ゲートピンの開信号 １６ ゲートピンの駆動装置 ａ 平行部長さ ｂ 樹脂貯溜部 ｃ ゲート内径 ｄ ゲートピン先端の外径 Reference Signs List 1 mounting plate 2 sprue nozzle 3 spacer 4 cavity block 4a mold cavity 5 manifold 6 hot runner 8 gate pin 9 steady rest 10 molding machine control unit 11 hydraulic control unit 12 resin filling completion signal 13 mold closing completion signal 14 gate pin closing signal 15 gate pin Open signal 16 Gate pin driving device a Parallel part length b Resin storage part c Gate inside diameter d Outside diameter of gate pin tip
Claims (2)
射出成形用金型において、ゲート部先端に保圧による樹
脂充填量に相当する樹脂量を貯溜できる樹脂貯溜部があ
ることを特徴とする射出成形用金型。1. An injection molding die having a gate pin having a shut-off structure, characterized in that a tip end of the gate portion has a resin storage portion capable of storing a resin amount corresponding to a resin filling amount due to holding pressure. Mold.
構造のゲートピンでゲート部を閉じ、次いでゲート部先
端の樹脂貯溜部から保圧による樹脂充填量に相当する樹
脂量を注入することを特徴とする射出成形方法。2. After the filling of the resin is completed, the gate portion is closed with a gate pin having a shut-off structure, and then a resin amount corresponding to the resin filling amount due to the holding pressure is injected from a resin storage portion at the tip of the gate portion. Injection molding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6127198A JPH11254490A (en) | 1998-03-12 | 1998-03-12 | Mold for injection molding and method for injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6127198A JPH11254490A (en) | 1998-03-12 | 1998-03-12 | Mold for injection molding and method for injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11254490A true JPH11254490A (en) | 1999-09-21 |
Family
ID=13166398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6127198A Pending JPH11254490A (en) | 1998-03-12 | 1998-03-12 | Mold for injection molding and method for injection molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11254490A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7513772B2 (en) | 2007-05-09 | 2009-04-07 | Mold-Masters (2007) Limited | Injection molding nozzle with valve pin alignment |
| CN103600467A (en) * | 2013-10-17 | 2014-02-26 | 苏州好特斯模具有限公司 | Torpedo needle |
| KR101434795B1 (en) * | 2013-06-10 | 2014-08-26 | 나라엠앤디(주) | Open-gate nozzle apparatus for hot-runner system |
| WO2016147928A1 (en) * | 2015-03-17 | 2016-09-22 | Ntn株式会社 | Housing, fluid dynamic pressure bearing device with same, and method for manufacturing housing |
| JP2016173137A (en) * | 2015-03-17 | 2016-09-29 | Ntn株式会社 | Housing for fluid dymanic pressure bearing device and manufacturing method for the same |
| JP2016173136A (en) * | 2015-03-17 | 2016-09-29 | Ntn株式会社 | Housing for fluid dymanic pressure bearing device |
| WO2017061998A1 (en) * | 2015-10-07 | 2017-04-13 | Synventive Molding Solutions, Inc. | Injection molding apparatus comprising a fluid channel flow disruption |
-
1998
- 1998-03-12 JP JP6127198A patent/JPH11254490A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7513772B2 (en) | 2007-05-09 | 2009-04-07 | Mold-Masters (2007) Limited | Injection molding nozzle with valve pin alignment |
| KR101434795B1 (en) * | 2013-06-10 | 2014-08-26 | 나라엠앤디(주) | Open-gate nozzle apparatus for hot-runner system |
| CN103600467A (en) * | 2013-10-17 | 2014-02-26 | 苏州好特斯模具有限公司 | Torpedo needle |
| WO2016147928A1 (en) * | 2015-03-17 | 2016-09-22 | Ntn株式会社 | Housing, fluid dynamic pressure bearing device with same, and method for manufacturing housing |
| JP2016173137A (en) * | 2015-03-17 | 2016-09-29 | Ntn株式会社 | Housing for fluid dymanic pressure bearing device and manufacturing method for the same |
| JP2016173136A (en) * | 2015-03-17 | 2016-09-29 | Ntn株式会社 | Housing for fluid dymanic pressure bearing device |
| WO2017061998A1 (en) * | 2015-10-07 | 2017-04-13 | Synventive Molding Solutions, Inc. | Injection molding apparatus comprising a fluid channel flow disruption |
| US10493674B2 (en) | 2015-10-07 | 2019-12-03 | Synventive Molding Solutions, Inc. | Fluid channel flow disruption |
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